Fix crash caused when speech is generated at Chrome OS startup before ExtensionService is initializ…

chrome/browser/speech/extension_api/tts_engine_extension_api.cc

Index: chrome/browser/speech/extension_api/tts_engine_extension_api.cc
diff --git a/chrome/browser/speech/extension_api/tts_engine_extension_api.cc b/chrome/browser/speech/extension_api/tts_engine_extension_api.cc
index 8ed12c623300ca06a61169c0069ccb1de90017e9..7e80c3613d77570fde8c09725e8f1e56912c3ca4 100644
--- a/chrome/browser/speech/extension_api/tts_engine_extension_api.cc
+++ b/chrome/browser/speech/extension_api/tts_engine_extension_api.cc
@@ -99,7 +99,12 @@ bool GetMatchingExtensionVoice(
     return false;
 
   ExtensionService* service = utterance->profile()->GetExtensionService();
-  DCHECK(service);
+
+  // If speech is generated when Chrome OS first starts up, it's possible
+  // the extension service isn't even available.
+  if (!service)
+    return false;
+
   extensions::EventRouter* event_router =
       utterance->profile()->GetExtensionEventRouter();
   DCHECK(event_router);